Microsoft  (MSFT)  founder Bill Gates is the world's richest man for the fourth year in a row with an estimated net worth of $86 billion, according to Forbes' 31st Annual World's Billionaire List. 

Warren Buffett, CEO of Berkshire Hathaway (BRK.B)  , is the world's second richest man, with a net worth of $75.6 billion, up from $60.8 billion in 2016. 

With a net worth of $72.8 billion, Amazon.com (AMZN) CEO JeffBezos is now the third richest billionaire in the world.

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